Lamellar Body Count in Amniotic Fluid

Why Is This Test Done?

Doctors may order this test if you’re at risk for preterm labor or if your pregnancy is near the expected due date. It helps identify whether your baby’s lungs are mature enough to function outside the womb, reducing the risk of respiratory distress syndrome in newborns.

What Does the Test Measure?

Lamellar bodies are tiny, spherical structures found in the amniotic fluid surrounding the fetus. They contain phospholipids, which are essential for lung surfactant production—a substance that helps keep airways open and prevents collapse. The test counts these bodies to estimate fetal lung readiness.

What to Expect Before the Test

The test involves an amniocentesis, where a small needle is used to safely remove a small amount of amniotic fluid from your uterus. The fluid is then analyzed under a microscope to count lamellar bodies. This procedure is typically done in a hospital setting under sterile conditions.

What Happens During the Test?

You’ll lie on your back with your belly supported, and a doctor will insert a needle through your abdomen and uterus to collect amniotic fluid. The fluid is sent to a lab for analysis. The process usually takes about 10–15 minutes, and you’ll be monitored closely for any complications.